Dumping photos from your camera to your computer can be a pain, which is why wireless SD cards are pretty great. No cables! But Toshiba's new wireless SD card is the first that can also have your computer wirelessly send files to it as well.
All other wireless cars, such as the Eye-Fi, can only work in one direction. This card opens up the possibility for cameras to have the ability to shoot photos back and forth. Of course, no cameras could do that at the moment, but you know, someday.
As of now there's no pricing or availability info, and they've only shown off an 8GB model. But expect there to be various sizes of this thing when it's eventually released.